Abstract
The structural and electrochemical properties of LiCoO2 (LCO) cathode films grown at 500°C and Li0.5La0.5TiO3 (LLTO) solid electrolyte films at room temperature by pulsed laser deposition were investigated by a rapid-thermal annealing (RTA) treatment. The LCO films annealed for 1min at 700°C showed the most superior crystallinity and the LLTO films grown on LCO at room temperature maintained an amorphous phase after RTA treatment for 5min up to 700°C. The highest initial discharge capacity and capacity retention were obtained in Li∕LiCoO2 cells annealed for 1min at 700°C. The RTA treatment is effective in improvement of an interface property and surface morphology of the LLTO films grown at room temperature on LCO. The LCO/Pt cells exhibit an initial discharge capacity of approximately 53μAhcm−2μm and a capacity retention of 73% at 100cycles. The LLTO/LCO/Pt cells treated at 700°C for 5min in an oxygen ambient by RTA exhibited an improvement of a capacity retention as high as 96.1% at 100cycles.
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